Internal-combustion engine



Aug. 7,' 1928. 1,679,868

- w. H. MILLSPAUGH INTERNAL COMBUSTION ENGINE Filed 001:. 11, 1923 2 Sheets-Sheet l ATTORNEY Patented Aug; 7, 1928.

UNITED STATES wrnnrm n. mirnsraoen, or sAnnnsKY, onro.

INTERNAL-COMBUSTION ENGINE.

Application filed October ll, 1923.

This invention relates to two-cycle internal combustion engines of the reciprocating sleeve valve type.

The invention has for its salient object to improve the operation of engines of the character described.

Another object of the invention is to provide a two-cycle engine of the type defined having the parts. so constructed and 'arm ranged as to secure a thorough scavenging connection and more complete and efficient combustion. of the fuel.

Another and more specific object of the invention is to provide means for so operating the sleeve with relation/t0 the piston that the down stroke of the sleeve valve will be relatively slower than the up stroke thereloy causing air to be admitted in the cylinder during theup stroke.

Another object of the invention is to provide an engine of the type described that is simple in construction and comprises few operative parts and can be, economically manufactured.

' pear from the following specification taken in connection with the drawings, which form a part of this application, and in which Fig. 1 is a longitudinal sectional elevation so the invention.

Fig. 2 is a longitudinal sectional elevation taken substantially at right angles to Fig. 1. Fig. 3 is a transverse sectional elevation talfien substantially on line 3-3 of Fig. 1, an

Figs. 4, 5, 6,7 and 8 are sectional elevations illustrating diagrammatically the relative positions of the operative parts of the engine at difierent points inthe cycle of operation thereof. In these ,figures,- Fig. 4 shows the parts of the power stroke.

- Fig. 5 illustrates the positions of the parts near the end of the power stroke when the exhaust ports of the sleeve valve are opening.

Fig. 6 shows the parts in a position sllghtly in advance of the position shown in Fig. 5 and in which the-exhaust ports are still open and the intake ports are open.

at the beginning Fig. 7 shows the parts at the eginning of:-

Further objects of the invention will ap-.

out an engine constructed in accordance with Serial No. 667,862.

the in or up stroke or compression stroke with the exhaust ports closed and the intake POItSSiJlll open, and

Fig. 8 shows the parts with'the exhaust i ports still closed and the intake ports also closed, this being the portion of the cycle in which the compression starts.

The invention briefly described consists of an internal combustion engine comprising a cyhnder, a Working piston therein, and a sleeve valve reciprocable between the piston and cylinder. The sleeve valve is provided with intake ports and exhaust ports and the sleeve and piston are so relatively arranged that on the down or power stroke of the piston, the exhaust ports of the sleeve valve will be opened to the exhaust openings in the cylinder block as the piston approaches its lower or outer position and will remain open until after the intake ports have opened whereby air, preferably under compressions, will rush into the cylinder thereby scavenging the cylinder. The exhaust ports will close shortly after the intake ports have opened thereby trapping air in the cylinder, which is compressed on the up stroke of the piston. The piston and sleeve valve connections are so constructed and arranged that the down or out stroke of the sleeve valve, opening the intake ports will be relatively slow compared to the upstroke .or in stroke during which the intake ports are closed. Further details of the invention will appear from the following description.

Referring to the drawings, the engine illustrated is of the inverted head type and comprises a cylinder 10, a working piston 11 mounted in the cylinder and connected by a connecting rod 12 to the crank 13 mounted on a crank shaft 14.

Fuel is injected through an opening 15 in the cylinder head, this injection being preferably controlled by a governor and a separate fuel pump being provided for each cylinder A sleeve valve 16 of the reciprocating type is mounted between the cylinder 10 and the piston 11 and this valve is provided with a plurality of circumferentially arranged intake ports 17 and exhaust ports 18. The

exhaust ports 18 are adapted to establish communication between the space within the sleeve valve and the exhaust ports 19 formed in the wall of the cylinder and communicating with an exhaust chamber 20 in the cylinder head.

The intake ports 17 are adapted to admit air from the interior of the crank case 21 into the cylinder in a manner hereinafter described.

The sleeve valve 16 is connected by a link 22 to a yoke 23 pivoted at 24 to a lug 25 formed on the interior of the crank case. In this yoke is mounted a sliding block 26 having journaled therein an eccentric 27 which in turn is mounted on the crank shaft 14. As the shaft rotates, the block Will reciprocate in the yoke thereby givin a motion of translation to the sleeve-Va ve in a manner hereinafter described.

As illustrated in Fig. 2, a pair of links 22 may be used to connect the sleeve Valve to a pair of yokes 23.

The operation of the construction above described will now be set forth. Fig. 4. illustrates the parts in the position taken at the beginning of the down or power stroke of the piston. In this figure, it will be noted that the intake and exhaust ports of the sleeve valve are closed.

WVhen the parts reach the position shown in Fig. 5, which is approximately 23 degrees in advance of the completion of the power stroke, the exhaust ports in the sleeve valve are beginning to open, while the intake ports are still covered by the piston.

In Fig. 6 the exhaust ports are still open and the intake ports are being uncovered by the piston. At this period in the cycle the compressed air from the crank case or from the compressors, as desired, is entering the cylinder and is scavenging the cylinder, expelling therefrom the burnt gases.

In Fig. 7 the exhaust ports are closed and the intake ports are stillopen.

In Fig. 8 the intake ports have been closed thereby trapping the air in the cylinder and during the remainder of the up stroke the trapped air will be compressed by the piston.

' It will benoted that the opening of the intake ports in the sleeve valve consumes a greater time than the closing thereof or, in other words, the particular operative connections for the sleeve valve will give a slow downward movement to the sleeve and a quick return. The yoke and sliding block arrangement is familiarly known as the Whitworth quick return yoke.

If desired, as above stated, the air in the crank case may be compressed on the down stroke of the iston thereby furnishing compressed air or the cylinder and if this is done a valve 30 may be provided in the crank case, this valve opening on the up stroke of the piston and closing on the down stroke.

Although one specific embodiment of the invention has been particularly shown and described, it will be understood that the in vention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts may be made wthout departing from the spirit or scope of the invention, as expressed in the following claims.

WVhat I claim is:

1. A two-cycle internal combustion engine comprising a cylinder having exhaust ports adjacent the inner end thereof, a piston operating in said cylinder, a crank shaft, a sleeve valve slidably mounted between the piston and cylinder and having exhaust ports, air intake ports intermediate the ends thereof, and operative connections including a quick return yoke between said sleeve valve and the crank shaft so arranged that said sleeve valve will be given a relatively slow movement near the end of each outward stroke to open the exhaust ports and the air intake ports and will close the exhaust ports near the end of each outward stroke, and a relatively fast return movement during the inward stroke of the piston whereby air admitted under pressure will be entrapped in the cylinder.

2. In a two-cycle internal combustion engine, a cylinder, a piston operating -therein, said cylinder havlng an exhaust port, a sleeve valve slidably mounted between the cylinder and piston and having intake and exhaust ports therein, a crank shaft, 0. connecting. rod between the crank shaft and piston and operative connections includin a yoke connected to the sleeve valve an pivoted in the crank case, a block slidably mounted in the yoke and eccentrically mounted on the crank shaft between the crank shaft and sleeve valve whereby the intake ports of the sleeve valve will be opened before the exhaust ports of said valve are closed and will remain open after said exhaust ports are closed.

3. A two-cycle internal combustion engine comprising a cylinder having exhaust ports adjacent the upper end thereof, a piston operating in said cylinder, a crank shaft, a sleeve valve slidably mounted between the piston and cylinder and having exhaust ports adjacent the upper end thereof and intake ports intermediate the ends thereof and operative connections between said sleeve valve and said crank shaft whereby the exhaust ports of the sleeve valve will be opened and the intake ports of the sleeve valve will be opened before the exhaust orts are closed, both sets of these ports eing open prior 'to the completion of the out stroke of the piston and whereby the exhaust ports will be closed prior to the closing of the intake ports on the in stroke of the piston, said operative connections including a yoke. pivoted on the crank case, a block slidable in the yoke, an eccentric journaled in lid the block and mounted on the crank shaft and a link connecting the yoke and sleeve ports adjacent the upper end thereof and intake ports intermediate the ends thereof and operative connections includingaWhitworth quick return yoke between said sleeve valve and said crank shaft whereby the exhaust ports of the sleeve valve will be opened and the intake ports of the sleeve valve will be opened before the. exhaust ports are closed, both sets of these ports being open prior to the completion of the out stroke of the piston and whereby the exhaust ports will be closed prior to the closing of the intake ports on the in stroke of the piston.

5. A two-cycle internal combustion enginev comprising a cylinder having exhaust ports adjacent the upper end thereof, a piston operating in said cylinder, a crank. shaft, a sleeve valve slidably mounted between the piston and cylinder and having exhaust ports adjacent the upper end thereof and air intake ports intermediate the ends thereof and operative connections including 'a quick return yoke between said sleeve valve and said crank shaft so arranged that said sleeve valve will be given a relatively slow movement near the end of-each outward stroke to open the exhaust ports and the air intake ports and will close the exhaust ports near the end of each outward stroke and a rela tively fast return movement during the upward stroke of the piston, whereby air admitted under pressure is entrapped in the cylinder.

In witness whereof, I have hereunto set my hand this 8th day of October, 1923.

WILLIAM H. MILLSPAUGH. 

